Buggy code:
public class CSVParserTest { private static final String CSV_INPUT = "a,b,c,d\n" + ( ( "<seq2seq4repair_space>a<seq2seq4repair_space>,<seq2seq4repair_space>b<seq2seq4repair_space>,<seq2seq4repair_space>1<seq2seq4repair_space>2<seq2seq4repair_space>\n" + "\"foo<seq2seq4repair_space>baar\",<seq2seq4repair_space>b,\n" ) + "<seq2seq4repair_space>\"foo\n,,\n\"\",,\n\"\"\",d,e\n" ) ; private static final String CSV_INPUT_1 = "a,b,c,d" ; private static final String CSV_INPUT_2 = "a,b,1<seq2seq4repair_space>2" ; private static final String [ ] [ ] RESULT = new String [ ] [ ] { new String [ ] { "a" , "b" , "c" , "d" } , new String [ ] { "a" , "b" , "1<seq2seq4repair_space>2" } , new String [ ] { "foo<seq2seq4repair_space>baar" , "b" , "" } , new String [ ] { "foo\n,,\n\",,\n\"" , "d" , "e" } } ; @ Test public void testBackslashEscaping ( ) throws IOException { } @ Test public void testBackslashEscaping2 ( ) throws IOException { } @ Test @ Ignore public void testBackslashEscapingOld ( ) throws IOException { } @ Test @ Ignore ( "CSV-107" ) public void testBOM ( ) throws IOException { } @ Test public void testBOMInputStream ( ) throws IOException { } @ Test public void testCarriageReturnEndings ( ) throws IOException { } @ Test public void testCarriageReturnLineFeedEndings ( ) throws IOException { } @ Test ( expected = NoSuchElementException . class ) public void testClose ( ) throws Exception { } @ Test public void testCSV57 ( ) throws Exception { } @ Test public void testDefaultFormat ( ) throws IOException { final String code = "" + ( ( ( "a,b#\n" + "\"\n\",\"<seq2seq4repair_space>\",#\n" ) + "#,\"\"\n" ) + "#<seq2seq4repair_space>Final<seq2seq4repair_space>comment\n" ) ; final String [ ] [ ] res = new String [ ] [ ] { new String [ ] { "a" , "b#" } , new String [ ] { "\n" , "<seq2seq4repair_space>" , "#" } , new String [ ] { "#" , "" } , new String [ ] { "#<seq2seq4repair_space>Final<seq2seq4repair_space>comment" } } ; CSVFormat format = CSVFormat . DEFAULT ; <START_BUG> assertFalse ( format . isCommentStartCharacterSet ( ) ) ; <END_BUG> CSVParser parser = CSVParser . parse ( code , format ) ; List < CSVRecord > records = parser . getRecords ( ) ; assertTrue ( ( ( records . size ( ) ) > 0 ) ) ; Utils . compare ( "Failed<seq2seq4repair_space>to<seq2seq4repair_space>parse<seq2seq4repair_space>without<seq2seq4repair_space>comments" , res , records ) ; final String [ ] [ ] res_comments = new String [ ] [ ] { new String [ ] { "a" , "b#" } , new String [ ] { "\n" , "<seq2seq4repair_space>" , "#" } } ; format = DEFAULT . withCommentMarker ( '#' ) ; parser . close ( ) ; parser = CSVParser . parse ( code , format ) ; records = parser . getRecords ( ) ; Utils . compare ( "Failed<seq2seq4repair_space>to<seq2seq4repair_space>parse<seq2seq4repair_space>with<seq2seq4repair_space>comments" , res_comments , records ) ; parser . close ( ) ; } @ Test public void testEmptyFile ( ) throws Exception { } @ Test public void testEmptyLineBehaviourCSV ( ) throws Exception { } @ Test public void testEmptyLineBehaviourExcel ( ) throws Exception { } @ Test public void testEndOfFileBehaviorCSV ( ) throws Exception { } @ Test public void testEndOfFileBehaviourExcel ( ) throws Exception { } @ Test public void testExcelFormat1 ( ) throws IOException { } @ Test public void testExcelFormat2 ( ) throws Exception { } @ Test public void testForEach ( ) throws Exception { } @ Test public void testGetHeaderMap ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testDuplicateHeaders ( ) throws Exception { } @ Test public void testGetLine ( ) throws IOException { } @ Test public void testGetLineNumberWithCR ( ) throws Exception { } @ Test public void testGetLineNumberWithCRLF ( ) throws Exception { } @ Test public void testGetLineNumberWithLF ( ) throws Exception { } @ Test public void testGetOneLine ( ) throws IOException { } @ Test public void testGetOneLineOneParser ( ) throws IOException { } @ Test public void testGetRecordNumberWithCR ( ) throws Exception { } @ Test public void testGetRecordNumberWithCRLF ( ) throws Exception { } @ Test public void testGetRecordNumberWithLF ( ) throws Exception { } @ Test public void testGetRecords ( ) throws IOException { } @ Test public void testGetRecordWithMultiLineValues ( ) throws Exception { } @ Test public void testHeader ( ) throws Exception { } @ Test public void testHeaderMissing ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testHeadersMissingException ( ) throws Exception { } @ Test public void testHeadersMissing ( ) throws Exception { } @ Test public void testHeaderMissingWithNull ( ) throws Exception { } @ Test public void testHeaderComment ( ) throws Exception { } @ Test public void testIgnoreEmptyLines ( ) throws IOException { } @ Test ( expected = IllegalArgumentException . class ) public void testInvalidFormat ( ) throws Exception { } @ Test public void testIterator ( ) throws Exception { } @ Test public void testLineFeedEndings ( ) throws IOException { } @ Test public void testMappedButNotSetAsOutlook2007ContactExport ( ) throws Exception { } @ Test public void testMultipleIterators ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testNewCSVParserNullReaderFormat ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testNewCSVParserReaderNullFormat ( ) throws Exception { } @ Test public void testNoHeaderMap ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testParseFileNullFormat ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testParseNullFileFormat ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testParseNullStringFormat ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testParseNullUrlCharsetFormat ( ) throws Exception { } @ Test ( expected = IllegalArgumentException . class ) public void testParserUrlNullCharsetFormat ( ) throws Exception { }

Fix:
assertFalse ( format . isCommentMarkerSet ( ) ) ;